But, you should know that there are other varieties of iguana also, which are mostly found in the forests. The different varieties of iguanas may have dissimilar looks, but all of them resemble in relation to their diet, habits. The different varieties of iguana are: 1. Ctenosaura- spiny-tailed iguana. Males have bigger horns Diet and Lifestyle of Rhinoceros Iguana: Rhinoceros Iguana is also a vegetarian species. They eat leaves, seeds, flowers and fruits. Their diet changes as the seasons change. Sometimes they eat insects, animal food, land crabs and carrions. Small animals and insects are pet food for young Rhinoceros Iguanas. Information on Red Iguana: Their Main Features Iguanas are the largest species in the Lizards. The green iguanas are the most favorite as pets. There is a type of iguanas with a colorful skin. This variety is called red iguana. The most popular among the red iguanas is Red Sided Skink. This is a terrestrial variety, which is multicolored and is semi aquatic. They have exceedingly sharp claws. The crest on the back of males is heavier than female iguanas. They have a wide mouth and sharp teeth, short nostrils and exterior ear drums. Iguanas have a third eye also at top of head, which watches the movements over the head. Red Sided Skink iguanas also have a third eye. This iguana is also known as Galapagos Land Iguana and basically eats plants and cactus. The next varieties, Genus Ctenosauria are spiny tailed iguanas. They are basically natives of Mexico and Central America. Further, they are very small in comparison to other varieties of iguanas and can grow only from 5 inches to 35 inches in length. It is very important to know about the proper food for these animals for their right growth and to keep them healthy. Feeding only lettuce is not a solution. As the owner of the pet, you should feed them healthy and nutritious food. Here are a few useful leads regarding the food for iguanas. 1. Vegetables: Some people advise that iguanas can be fed on insects and worms or food meant for dogs and cats.